ci: improve workflows

[luc122c]

🔗 Linked issue

Related: #2971

🧭 Context

A few improvements to the GitHub Actions workflows, following the same pass I've been doing across other repos.

📚 Description

ubuntu-slim runner

Use ubuntu-slim for the lightweight jobs — ci.yml (i18n), stale.yml, welcome-open.yml, mirror-tangled.yml, and deploy-canary.yml. The runner readme provides more info about the tools and the GA blog post gives some potential use cases.

The heavier jobs (full dependency install + local build) stay on ubuntu-24.04-arm: lint (the oxc-parser-based linter needs more than the 5 GB RAM on ubuntu-slim), types, unit, test, browser, knip, autofix, and zizmor (which runs as a Docker-container action and needs a Docker-capable runner). a11y stays on ubuntu-latest for the documented Lighthouse reason. deploy-canary and mirror-tangled only install a CLI / do git ops, so the build that matters for canary happens remotely on Vercel.

parallel keyword

Run the two independent Codecov uploads (test results + coverage) in parallel in the unit and test jobs, using the new native parallel keyword.

Restrict preview/comment workflows to the main repo

Gate chromatic.yml and lunaria.yml behind if: github.repository == 'npmx-dev/npmx.dev' so fork PRs don't consume Chromatic builds or trigger pull_request_target comments in the org repo. The other release/deploy/mirror/comment workflows already had this guard.

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
docs.npmx.dev	Ready	Preview	Aug 17, 2026 8:57am
npmx.dev	Ready	Preview	Aug 17, 2026 8:57am

1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
npmx-lunaria	Ignored		Aug 17, 2026 8:57am

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: ccca72c1-a7c4-4b94-92d7-dea33ab82f2b

📥 Commits

Reviewing files that changed from the base of the PR and between c96614d and 101912b.

📒 Files selected for processing (4)

• .github/workflows/chromatic.yml
• .github/workflows/ci.yml
• .github/workflows/deploy-canary.yml
• .github/workflows/lunaria.yml

🚧 Files skipped from review as they are similar to previous changes (4)

• .github/workflows/chromatic.yml
• .github/workflows/lunaria.yml
• .github/workflows/deploy-canary.yml
• .github/workflows/ci.yml

Included review availability: Your plan includes up to 8 reviews per rolling hour; 7 remain after this review.

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📝 Walkthrough

Summary by CodeRabbit

• Chores
  • Updated automation jobs to use a streamlined runner configuration.
  • Restricted selected repository-specific workflows to run only in the intended repository.
  • Separated unit-test and component-test reporting steps while preserving test and coverage uploads.
  • Maintained existing deployment, mirroring, stale-management and localisation workflow behaviour.

Walkthrough

GitHub Actions workflows now restrict selected jobs to the target repository, use ubuntu-slim runners, and run unit-test and component-test Codecov uploads in parallel.

Changes

CI workflow updates

Layer / File(s)	Summary
Parallelise test reporting .github/workflows/ci.yml	Unit-test and component-test Codecov uploads now use separate parallel test-result and coverage steps.
Update workflow execution rules and runners .github/workflows/*.yml	Chromatic and Lunaria jobs now require the npmx-dev/npmx.dev repository. Selected jobs now use ubuntu-slim runners.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly and concisely describes the workflow improvements in the changeset.
Description check	✅ Passed	The description directly explains the runner, Codecov, and repository-gating changes in the workflows.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

📢 Thoughts on this report? Let us know!

[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Inline comments:
In @.github/workflows/welcome-open.yml:
- Line 18: Update the greeting job’s runs-on setting from ubuntu-slim to a full
Ubuntu runner such as ubuntu-latest so the Docker-based
zephyrproject-rtos/action-first-interaction step can execute successfully.

🪄 Autofix

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: f22f5430-48a1-4ba2-9ad8-51b06f62b94a

📥 Commits

Reviewing files that changed from the base of the PR and between 4b40e42 and c96614d.

📒 Files selected for processing (7)

• .github/workflows/chromatic.yml
• .github/workflows/ci.yml
• .github/workflows/deploy-canary.yml
• .github/workflows/lunaria.yml
• .github/workflows/mirror-tangled.yml
• .github/workflows/stale.yml
• .github/workflows/welcome-open.yml

[serhalp]

Makes sense to me, thank you!

[ghostdevv]

Changes sound good to me, just wanna try and follow up on why the changes to the runners were originally made - will get back to you soon hopefully 🙏